Removing or installing a barrel can be very hard on the index pin, especially if it is or was over tightened. The Mid West receiver rod removes the torque from the index pin. The MI Upper Receiver Rod also can be used to test the barrel nut alignment . https://www.midwestindustriesinc.com/MI-...mi-urr.htm The Geissle Super Reaction Rod https://geissele.com/super-reaction-rod-...liber.html addressed this problem, compared to their standard reaction rod. https://www.midwayusa.com/product/1007066047 Clam shell clamps have the same problem.. With my Magpul bev block, the tab does not seem to be tight enough from preventing stress on the index pin..https://magpul.com/bevblock-ar15-m4.html..._color=118
Here is a good video about this subject https://www.arbuildjunkie.com/ar-15-reac...ith-sotar/
Here is a good video about this subject https://www.arbuildjunkie.com/ar-15-reac...ith-sotar/